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Old 05-13-2010, 11:37 PM   #21
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Thanks everyone. I got the shroud off, cleaned the coils, and figured out where the filters go. Worked on it all day. It ran 30 minutes, tripped the breaker, now the fan won't run. Back to the drawing board. I did figure out that it is an Armstrong with a heater. Anyone know how to tell how old it is by either the model or serial numbers?
The last year Airstream used a 2 piece shroud, was 1979.

That model of Armstrong AC was used from 1976 to 1979.

Thyat makes your AC 31 years old (young), as it was and is a good AC.

If you ran the AC using an inadequate extension cord, you may have ruined the compressor.

Andy
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Old 05-16-2010, 08:09 PM   #22
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1979 31' Sovereign
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I have tracked the problem to the fan motor. I would just try to replace it, but I can't get the fan blade or blower off the shaft. I have loosened the set screws but apparently 30 years makes them stubborn. Any suggestions? I can't find a way to get leverage on either since there are coils at both ends. Another thing that concerns me is that before it quit, the compressor was cycling on and off every 5 minutes or so. Is that normal?
If we have to get a new one, what is the best one to look for?
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Old 06-23-2010, 06:54 PM   #23
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armstrong ac roof fan replacement

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Originally Posted by redhawkerII View Post
When working on our shroud (getting dirt and small acumulation out) there were four screws that held it in place...there was no glue or anything like Andy mentions on this one and it just raises right up in a such and such manner.
The fan on the roof of my Armstrong ac spins hard and sometimes will not start if I get on roof and help it with a push it starts to spin and cools well.

Can this fan motor be oiled without removing shroud.

Is this motor able to be replaced?

I am camping at cedar point Ohio and don't want to be without ac

If needed anyone know of a good ac repair that would work on an Armstrong unitnear cedarpoint

Steve
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Old 06-23-2010, 09:12 PM   #24
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Old 06-23-2010, 10:10 PM   #25
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The fan on the roof of my Armstrong ac spins hard and sometimes will not start if I get on roof and help it with a push it starts to spin and cools well.

Can this fan motor be oiled without removing shroud.

Is this motor able to be replaced?

I am camping at cedar point Ohio and don't want to be without ac

If needed anyone know of a good ac repair that would work on an Armstrong unitnear cedarpoint

Steve
Lubing the fan motor, will extend it's life for many more months of service.

Andy
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Old 06-24-2010, 07:41 AM   #26
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Can the fan on roof be oiled from roof without taking off shroud?
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Old 06-24-2010, 08:22 AM   #27
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Can the fan on roof be oiled from roof without taking off shroud?
No.

There is a screen in the way, that can be removed, but you have to remove the shroud first.

Andy
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Old 06-25-2010, 02:05 PM   #28
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ac sometimes will not start

I have a 1972 27 ft international with the original Armstrong ac TR 21-12.

Recently the fan on roof that cools fins (I believe it is the condenser fan) hums and turns slowly but will not start. This seems to happen most often on low. I tried to lube fan but not sure where to lube. When the unit is off and I try to spin the fan it is somewhat stiff. Is there a replacement for this fan motor? Does it sound like a fan motor or something else?

Steve
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Old 06-25-2010, 02:12 PM   #29
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I have a 1972 27 ft international with the original Armstrong ac TR 21-12.

Recently the fan on roof that cools fins (I believe it is the condenser fan) hums and turns slowly but will not start. This seems to happen most often on low. I tried to lube fan but not sure where to lube. When the unit is off and I try to spin the fan it is somewhat stiff. Is there a replacement for this fan motor? Does it sound like a fan motor or something else?

Steve
Steve.

Remove the shroud.

You should then be able to lube the condenser motor.

Andy
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Old 06-25-2010, 03:33 PM   #30
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Just got done being motor very little change. Motor still spins hard and sometimes needs help starting.

Is there a current. Part number of motor from some place like grange

How about part number for capacitor as one ac repair guy said it might be a capacitor
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Old 06-25-2010, 05:02 PM   #31
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Sorry for all the typos guess I am not the best typest on my phone while in line at cedar point amusement park

I was trying to say I just finished lubing my motor

Still hoping someone can provide me with a replacement condenser fan motor I could find somewhere like granger. And a start capacitor.
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Old 06-25-2010, 06:20 PM   #32
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Sorry for all the typos guess I am not the best typest on my phone while in line at cedar point amusement park

I was trying to say I just finished lubing my motor

Still hoping someone can provide me with a replacement condenser fan motor I could find somewhere like granger. And a start capacitor.
If the motor spins hard, then that's the problem, not a condenser.

A bad condenser will not make the shaft turn hard.

Did you lube both ends of the shaft?

You can, if you wish, disassemble the motor, clean up the bearing sleeves, clean up the armature shaft, lube it again, and then reassemble. The shaft should now turn freely.

W. W. Grainger does have a replacement motor, but I do not have the part number.

Andy
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